:root {
  color-scheme: light;
  --bg: #fbfbf8;
  --paper: #ffffff;
  --ink: #111318;
  --muted: #5e6672;
  --quiet: #8a929e;
  --line: #e0e4e8;
  --line-strong: #c4cbd3;
  --code: #f4f6f6;
  --accent: #0f6f73;
  --accent-2: #2f7a5b;
  --warn: #8a6424;
  --danger: #9f1d1d;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--ink);
  font-family:
    "Noto Sans SC", "PingFang SC", "Microsoft YaHei", ui-sans-serif,
    system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.72;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(15, 111, 115, 0.04), transparent 34%),
    radial-gradient(circle at 88% 8%, rgba(47, 122, 91, 0.08), transparent 26%);
  pointer-events: none;
}

a {
  color: inherit;
}

code,
pre {
  font-family: var(--mono);
}

code {
  border-radius: 3px;
  background: var(--code);
  color: #1f2933;
  padding: 2px 5px;
  font-size: 0.92em;
}

pre {
  width: 100%;
  max-width: 100%;
  margin: 16px 0 0;
  overflow-x: auto;
  border: 0;
  border-left: 3px solid var(--accent);
  background: var(--code);
  color: #1f2933;
  padding: 16px;
  font-size: 13px;
  line-height: 1.55;
}

pre code {
  background: transparent;
  padding: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(251, 251, 248, 0.92);
  backdrop-filter: blur(10px);
  padding: 13px clamp(18px, 4vw, 56px);
}

.brand {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
  text-decoration: none;
}

.brand span {
  font-weight: 780;
}

.brand strong {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
}

.topnav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px 18px;
  color: var(--muted);
  font-size: 13px;
}

.topnav a {
  text-decoration: none;
}

.topnav a:hover {
  color: var(--ink);
}

.layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 980px);
  gap: clamp(24px, 4vw, 56px);
  width: min(1280px, calc(100vw - 36px));
  margin: 0 auto;
  padding: 36px 0 72px;
}

.toc {
  position: sticky;
  top: 74px;
  align-self: start;
  border-left: 1px solid var(--line);
  padding: 4px 0 4px 18px;
}

.toc-title {
  margin: 0 0 12px;
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
}

.toc a {
  display: block;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
  text-decoration: none;
  padding: 7px 0 7px 12px;
}

.toc a:hover {
  border-left-color: var(--accent);
  color: var(--ink);
}

.article {
  min-width: 0;
}

.article *,
.toc *,
.topbar * {
  min-width: 0;
}

.section {
  border-top: 1px solid var(--line);
  padding: clamp(40px, 5.6vw, 66px) 0;
}

.lead-section {
  border-top: 0;
  padding-top: 18px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(42px, 6vw, 70px);
  line-height: 1.06;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.14;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 19px;
  line-height: 1.28;
}

p {
  max-width: 880px;
  margin: 14px 0 0;
  color: var(--muted);
}

.lead {
  max-width: 920px;
  color: #2c333d;
  font-size: clamp(18px, 2.3vw, 23px);
  line-height: 1.62;
}

.definition-grid,
.principles,
.entity-grid,
.two-column,
.command-grid,
.doc-grid,
.code-map,
.chains {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.definition-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 20px 0;
}

.definition-grid div,
.principles div,
.two-column > div,
.command-grid > div,
.code-map article,
.chains > div,
.doc-grid a {
  min-width: 0;
  border: 0;
  background: transparent;
}

.definition-grid span,
.entity-grid span,
.lane-label {
  display: block;
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 12px;
}

.definition-grid strong,
.entity-grid strong {
  display: block;
  margin-top: 7px;
  color: var(--ink);
  font-size: 17px;
}

.definition-grid p,
.entity-grid span {
  font-size: 14px;
}

.check-list,
.numbered {
  max-width: 900px;
  margin: 18px 0 0;
  padding-left: 24px;
}

.check-list li,
.numbered li {
  margin: 8px 0;
  color: #3d4651;
}

.comparison-table {
  display: grid;
  margin-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.comparison-table > div {
  display: grid;
  grid-template-columns: 0.8fr 1fr 1.5fr;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  padding: 13px 0;
}

.comparison-table.compact > div {
  grid-template-columns: 0.85fr 0.55fr 1.7fr;
}

.comparison-table .head {
  color: var(--ink);
  font-weight: 760;
}

.comparison-table span {
  min-width: 0;
  color: #38414d;
}

.architecture-map {
  display: grid;
  grid-template-columns: 1.05fr 24px 1.25fr 24px 1.15fr;
  gap: 12px;
  margin-top: 28px;
  align-items: stretch;
}

.arch-lane,
.arch-branches {
  display: grid;
  gap: 12px;
  align-content: start;
  min-width: 0;
  border-top: 3px solid var(--accent);
  background: rgba(255, 255, 255, 0.48);
  padding: 14px;
}

.arch-lane-runtime {
  border-top-color: var(--accent-2);
}

.arch-branches {
  grid-column: 1 / -1;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top-color: var(--line-strong);
  margin-top: 2px;
}

.arch-node {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 13px;
}

.arch-node strong {
  display: block;
  color: var(--ink);
}

.arch-node span {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.arch-node-runtime,
.arch-node-gate {
  border-color: var(--line-strong);
}

.arch-connector {
  position: relative;
  min-height: 120px;
}

.arch-connector::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line-strong);
}

.arch-connector::after {
  content: "";
  position: absolute;
  top: calc(50% - 4px);
  right: 0;
  width: 8px;
  height: 8px;
  border-top: 1px solid var(--line-strong);
  border-right: 1px solid var(--line-strong);
  transform: rotate(45deg);
}

.principles {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  padding-top: 22px;
}

.principles p,
.two-column p,
.command-grid p,
.code-map p,
.chains p {
  color: var(--muted);
  font-size: 14px;
}

.screenshot {
  margin: 28px 0 8px;
}

.screenshot img {
  display: block;
  width: 100%;
  border: 1px solid var(--line-strong);
}

.caption {
  margin-top: 8px;
  color: var(--quiet);
  font-size: 13px;
}

.entity-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.entity-grid div {
  min-width: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 13px;
}

.numbered {
  list-style: decimal;
}

.numbered li {
  padding-left: 6px;
}

.numbered strong {
  color: var(--ink);
  font-size: 17px;
}

.code-map {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.code-map article {
  border-top: 1px solid var(--line);
  padding-top: 15px;
}

.code-map a,
.doc-grid a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.chains {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.command-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.two-column {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.two-column > div,
.command-grid > div {
  border-top: 1px solid var(--line);
  padding-top: 15px;
}

.faq-list {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

details {
  border-top: 1px solid var(--line);
  padding: 14px 0;
}

summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 760;
}

details p {
  margin-top: 10px;
}

.doc-links {
  padding-bottom: 24px;
}

.doc-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.doc-grid a {
  display: block;
  border-top: 1px solid var(--line);
  padding-top: 14px;
  text-decoration: none;
}

.doc-grid strong {
  display: block;
  color: var(--ink);
}

.doc-grid span {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 13px;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 24px clamp(18px, 4vw, 56px) 44px;
}

.footer p {
  width: min(1280px, calc(100vw - 36px));
  margin: 0 auto;
  color: var(--quiet);
  font-size: 13px;
}

@media (max-width: 980px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-left: 0;
    border-bottom: 1px solid var(--line);
    padding: 0 0 18px;
  }

  .toc-title {
    grid-column: 1 / -1;
  }

  .toc a {
    border-left: 0;
    padding-left: 0;
  }

  .architecture-map,
  .definition-grid,
  .principles,
  .entity-grid,
  .code-map,
  .chains,
  .command-grid,
  .two-column,
  .doc-grid {
    grid-template-columns: 1fr;
  }

  .arch-connector {
    display: none;
  }

  .arch-branches {
    grid-template-columns: 1fr;
  }

  .comparison-table > div,
  .comparison-table.compact > div {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

@media (max-width: 620px) {
  .topnav {
    justify-content: flex-start;
  }

  .toc {
    display: none;
  }

  h1 {
    font-size: 30px;
    line-height: 1.14;
  }

  h2 {
    font-size: 25px;
    line-height: 1.2;
  }

  .layout {
    width: min(100% - 28px, 1280px);
    padding-top: 24px;
  }

  .lead {
    font-size: 17px;
  }
}